Web Platforms & SaaS
Most SaaS products fail because they're built like websites. We build them like systems.
A SaaS product that converts is engineering, not marketing in disguise. It's multi-tenant from day one, scales without a rewrite, ships features without breaking yesterday's customers, and turns usage into revenue without a spreadsheet behind the scenes. Critonyx is the SaaS partnership for founders who already know that, and want to build accordingly.
The problem
Most SaaS founders aren't shipping software. They're shipping technical debt.
The MVP got built quickly, by someone who optimized for the demo, not the second year. Six months in, every new feature breaks an old one. Onboarding works for some customers, falls apart for others, and nobody quite knows why. The database is a graveyard of tenant data tangled together. The team is afraid to refactor because nothing is documented and nothing is tested.
We've seen this in dozens of cap tables. Founders who raised on a working product can't ship the second version. The codebase that got them to seed becomes the thing that stops them at Series A.
We exist for the founders who refuse to spend their next round paying down debt the previous build created.
Our commitments
Three commitments. Most SaaS builders won't make them.
We build multi-tenant from the first commit.
Most SaaS products are built single-tenant and made multi-tenant later. That migration is almost always a rewrite. We architect for tenancy from line one — schema, auth, billing, data isolation — because retrofitting it costs more than building it right the first time.
We treat the data model as the product.
Everything else is replaceable. Front-ends get redesigned, frameworks come and go, infrastructure gets migrated. The data model is what your business becomes. We spend disproportionate time on it before writing application code, because every shortcut here compounds into pain later.
We price on outcomes, not story points.
Milestone-based pricing, signed before kickoff, with no surprises along the way.
What we build
What we actually build
SaaS MVPs that survive the first year
Real multi-tenant architecture, real billing integration, real onboarding logic, shipped in weeks, not quarters. Built so the next ten features don't break the first ten.
Scale rebuilds for products that outgrew their MVP
When the working product is also the bottleneck. We replace the load-bearing parts without taking the business down, using strangler patterns, incremental migrations, and zero-downtime cutovers.
Internal admin and ops tools
The unsexy half of every SaaS company. The dashboards your support team uses, the back-office tools your finance team begs for, and the data exports that close enterprise deals. Built fast, scoped tight.
B2B integrations that hold up under audit
When your product has to talk to Salesforce, NetSuite, Stripe, or whatever your customer's stack demands, built with the observability, retries, and audit logs enterprise procurement actually checks for.
Customer-facing portals and self-serve flows
Account management, billing self-serve, usage dashboards, and role-based access — the features that move support tickets into product.
Before we build
The Critonyx Architecture Review
A one-week structured engagement for SaaS founders who've already shipped, and want to know what's actually under the hood before the next round of investment. We audit the architecture, the data model, the test coverage, the deployment pipeline, and the parts of the codebase nobody wants to open.
Most founders walk out either knowing they don't need a rewrite, or knowing exactly which slice of the codebase is costing them most of the pain.
You walk out with
- A plain-English read on the technical state of your product
- The three things that will break first as you scale
- A prioritised list of what to rebuild, what to leave alone, and what to throw away
- Cost and timeline modelling for each path
- A written architecture brief, not a slide deck
How we work
The ADAS Framework, adapted for web platforms & saas
Architect
Tenancy model, data model, billing model, and auth model. The four decisions that determine whether the product scales or stalls. We make them before any feature work begins.
Deliver
Specialist SaaS engineers, weekly cadence, milestone-priced. We ship the platform, the features, and the integrations, plus the test coverage that lets you ship the next ones without us.
Advise
Long-term partnership for founders making the hard architecture calls: when to refactor, when to rewrite, and when to leave it alone.
Scale
Once the product works, we scale it without the cost curve eating you alive. Tenant performance isolation, observability, capacity planning, and incident response.
Proof
“They rebuilt the parts that mattered, left the parts that worked, and shipped a product I could actually take to Series A.”
Founder, B2B SaaS
Read the case studyThe process
What happens after you reach out
30-minute fit call
You describe the product, the stage, and the friction. We ask the architecture questions most agencies skip: tenancy model, data isolation, billing logic, and scale targets. By the end of the call, we'll tell you whether this is a build problem, a rebuild problem, or something else entirely.
The Architecture Review
Recommended. One week, written recommendation. You leave with clarity even if we never work together.
Scoping & architecture
If we're building, we map the system: tenancy, data model, integrations, milestones, and cost ceiling.
Build & deploy
Most SaaS engagements have a working product in 6 to 10 weeks. Production-grade platforms in 12 to 16.
Partnership
Architecture decisions don't end at launch. We stay on because the launch is the easy part.
The smartest SaaS decision a founder can make is sometimes not to ship the next feature.
If you're sitting on a product that's working but starting to crack — feature velocity dropping, customer issues piling up, the team afraid to touch the codebase — that's a signal, not a phase. Book a call. We'll tell you whether you're closer to a refactor or a rebuild, and what each path actually costs.
Start the conversation
Ready to ship?
If you're a founder or operator building something serious, and you're tired of hourly billing, slow timelines, and partners who don't understand your business. Let's talk.
Prefer email? Write to us directly at info@critonyx.com